//
// (C) Copyright 2009 Irantha Suwandarathna (irantha@gmail.com)
// All rights reserved.
//

/* Copyright (c) 1995-2000, The Hypersonic SQL Group.
 * All rights reserved.
 *
 * Redistribution and use _in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions _in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer _in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the Hypersonic SQL Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the Hypersonic SQL Group.
 *
 *
 * For work added by the HSQL Development Group:
 *
 * Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use _in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions _in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer _in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


using System;


namespace EffiProzDB
{
    /**
     * Represents a single row table operation.
     *
     * @author Thomas Mueller (Hypersonic SQL Group)
     * @version 1.8.0
     * @since Hypersonic SQL
     */
    public class Transaction
    {

        public bool isDelete;
        public Table tTable;
        public Row row;
        public long SCN;

        /**
         * Constructor. <p>
         *
         * @param delete if true, this represents a single row delete action, else
         *      a single row insert action
         * @param nested true if this action is part of a transaction initiated
         *  within an INSERT INTO or UPDATE statement
         * @param table the Table object against which the operation occured
         * @param row the row data that iis inserted or deleted
         */
        public Transaction(bool delete, Table table, Row row, long SCN)
        {

            isDelete = delete;
            tTable = table;
            this.row = row;
        }

        /**
         * Undoes the single row delete or insert represented by this object.
         *
         * @param session the session context _in which to perform the undo
         * @param log if true log the work
         * @  if a database access error occurs
         */
        public void rollback(Session session, bool log)
        {

            try
            {
                if (isDelete)
                {
                    tTable.insertNoCheckRollback(session, row, log);
                }
                else
                {
                    tTable.deleteNoCheckRollback(session, row, log);
                }
            }
            catch (Exception)
            {

                //             Console.WriteLine("rollback error: isDelete " + isDelete);
            }
        }

        public void commit(Session session)
        {

            try
            {
                if (isDelete)
                {
                    tTable.removeRowFromStore(row);
                }
                else
                {
                    tTable.commitRowToStore(row);
                }
            }
            catch (Exception)
            {

                //             Console.WriteLine("rollback error: isDelete " + isDelete);
            }
        }

        public void logRollback(Session session)
        {

            try
            {
                if (isDelete)
                {
                    tTable.database.logger.writeInsertStatement(session, tTable,
                            row.getData());
                }
                else
                {
                    tTable.database.logger.writeDeleteStatement(session, tTable,
                            row.getData());
                }
            }
            catch (Exception) { }
        }

        public void logAction(Session session)
        {

            try
            {
                if (isDelete)
                {
                    tTable.database.logger.writeDeleteStatement(session, tTable,
                            row.getData());
                }
                else
                {
                    tTable.database.logger.writeInsertStatement(session, tTable,
                            row.getData());
                }
            }
            catch (Exception) { }
        }
    }
}
